package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * @BelongsProject: hm-dianping
 * @BelongsPackage: com.hmdp.utils
 * @Author: jiangyi
 * @CreateTime: 2025-09-23  10:27
 * @Description: TODO
 * @Version: 1.0
 */
@Component
public class RedisIdWorker {
    // 当前时间戳
    private static final long BEGIN_TIMESTAMP = 1758623478L;

    private static final long COUNT_BITS = 32;

    private StringRedisTemplate stringRedisTemplate;

    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public long nextId(String keyPrefix) {
        // 1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeStamp = nowSecond - BEGIN_TIMESTAMP;
        // 2.生成序列号
        // 2.1.获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":"+ date);
        // 3.拼接并返回
        return timeStamp << COUNT_BITS | count;
    }
}
